Crossword Genius

Schoolboy son Baltic citizen expels (7)

Ross

I believe the answer is:

etonian

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'schoolboy' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

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(Other definitions for etonian that I've seen before include "Public schoolboy" , "student in establishment?" , "Relating to one particular school" , "Public school boy" , "Alumnus of famous English school" .)

I've seen this clue in The Telegraph and The Sun.
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